Automatic revolving scbapeb



May 26, 1931, THRQQP 1,806,959

AUTOMATIC REVOLVING SCRAPER Filed July 15, 1929 '4 Sheets-Sheet 1 I In! 4 M.

ATTORNEY May 26, 1931. p. R. THROOP AUTOMATIC REVOLVING SCRAPER Filed July 15, 1929 4 Sheets-Sheet 2 NMME INVENTOR 17. R. Throop BY Q .LJMt;

ATTORNEY y 19316 D. R. THROOP AUTOMATIC REVOLVING SCRAPER Filed July 15, 1929 4 Sheets-Sheet 3 INVENTOR D. R T111) 0}? Q K A BTORNEY y 26, 1931- D. R. THROOP v AU'I'QMA'I'IC REVOLVING SCRAPER Filed July 15, 1929 4 Sheets-Sheet 4 INVENTOR 'D.R.Tbroop Q.M 6Y.LJ..L.SE; ATTORNEY Patented May 1931 I i UNITED STATES PATENT OFFICE DAMON R. THROOIP, F STQCKTON, CALIFORNIA AUTOMATIC REVOLVING SGBAPER Application filed July 15, 1929. Serial No. 378,240.

This invention relates to scrapers of the Fig. 1 is a side elevation partly in section turnable bowl or Fresno type, and particuof my'improved scraper in a loading posilarly to one of large size adapted to be drawn tion. by a tractor. I Fig. 2 is a similar view showing the posi- The principal object of my invention is to tion of the parts after a full load has been ob- 66 provide a scraper of this general character so 'tained and the scraper bowl has been raised constructed that the bowl when full will be to a non-scraping position.

automatically moved from scraping engage- Fig. 3 is a top plan view of the scraper in a ment with the ground without any attention loadlng position. on the part of the operator being necessary. Fig. 4 is a fragmentary cross section on the 00 At the same time should it be desired to take line 44 of Fig. -1.

on a heavier load it is only necessary for the Fig. 5 is a similar view: on the line 55 of operator to pull forward on aloading lever for Fig. 1.

the necessary length of time to effect the com- Fig. 6 is-a side elevation of a modified form 1 pletion of the loadingean operation which of Wheel mounted scraper. on account of the effectiveness of the lever Referring now more particularly to the provided is very easily accomplished. characters of reference on the drawmgs, and

By reason of my improved automatic particularly to Figs. 1 to 5, the numeral 1 deloading control feature it is impossible to notes the main frame beams of the structure,

90 stall the tractor regardless of any attention which at their forward ends are disposed in 7 on the part of the operator, since as soon as parallel and spaced relation to each other and the proper load has been attained the scraper then diverge toward their rear ends to receive automatically ceases scraping and loading, the bowl 2 therebetween; which bowl is pivthus relieving the tractor of any strains other oted substantially centrally of its length on 25 than that of the accumulated load. In contrunnions 3. Runners 4 concentric with the nection with this point it is of course necestrunnions project upwardly from the bowl sary that the scraper shall be firstadjusted at its sides for engagement with the ground according to the dirt conditions and the pullwhen the bowl is in a spreading or dumping ing capacity of the particular tractor being position, as is customary in devices of this so used, character.

The automatic control mechanism func- The tractor used in hauling the machine is tions efficiently regardless of the different not connected to the frame itself but to the kinds and relative weight of the dirt being forward end of a tongue 5. This tongue is scraped. Dumping or spreading operations slidably disposed and guided between the are also controlled very easily merely by aframes 1 at their forward ends and projects light pulley on the trip lever. through the cross member 6 of an auxiliary The same automatic control mechanism frame and brace structure 6a which is prowith a few modifications may also be readily vided in rigid relation with the frame interincorporated in a scraper of the wheel supmediate its front end and the bowl. Rollers 40 ported type so that the blade of the bowl may R on the frame at its front end engage the be either raised just to a non-scraping posito and bottom of the tongue at spaced tion or to a position fully clear of the ground points and prevent the displacement of the for transportation when empty. same relative to the frame while facilitating These objects I accomplish by meansof real lengthwise movement therebetween.

45 such structure and relative arrangement of Rearwardly of the member 6 the tongue has parts as will fully appear by a perusal of the a heavy and normally slack compression following specification and claims. spring 7 thereon which bears at one end In the drawings similar characters of refagainst said member 6 and acts to resist the erence indicate corresponding parts in the forward movement of the tongue relative to 50 several views: 7 the frame. Such forward movement of the tonormally prevent rotation of the bowl. A

normally vertical arm 13 projects upwardly from the shaft centrally between its ends and is pivotally connected to one end of a forwardly extending catch bar 14. This bar has a notch 15 in itsunder face near its forward end to normally receive a pin 16 fixed on a vertical link unit 17 which is pivoted toward its lower end'to the auxiliary frame structure 6a just below the tongue. The pivot pin 18 of this spring unit preferably has a roller 18a thereon on which the lower edge of the tongue rides. A tension spring 19 between the bar 14 and the frame holds said bar engaged with the pin, and another tension spring 20 connects the arm 13 and the link 17 to cause the catch bar to return to its normal longitudinal position after it has been released. A tri lever 21 is pivoted at one end on the link pre erably in common with the pin 16 and projects thence rearwardly and then upwardly, being connected at its upper end with a forwardly extending pull cord 22. At its lowermost point the trip lever has a roller 23 passing under the bar 14. Upon pulling the cord therefore the roller will be raised against the bar and the latter will be disengaged from the pin. This allows the weight and forward rotating tendency of the bowl to push the arms 11 down so that the adjacent pins'12 will clear the arms and the bowl will assume a spreading or dumping position. As usual one set of stops 12 controls the scraping position of the blade of thebowl, while the other controls the spreading position.

' Between the pivot and catch pins 18 and 15 the link 17 has another pin 24 placeable in a 7 number of vertically spaced holes 25. This pin rides in a longitudinally slotted member 26 projecting rearwardly from and pivoted on a bracket 27' secured to and projecting upwardly from the tongue 5. A hand loading lever 28 is pivoted adjacent its lower end on the tongue ahead of the bracket as at P and is connected to the lower end of the link 17 by links 29 which toward their forward ends have longitudinal slots 29a through which a cross pin 30 on the lever projects a short distance above its pivot.

position the ton In operation when the bowl is in a loading I e is in its rearmost position relative to the rame 1, the pin 24 is at the rear end of the slot in the member 26; the pin 30 is toward the rear end of the slot 29a,'while the stops and 9 are separated from each other.

' of the tongue.

scraped into the bowl. The resistance of this load to the forward movement of the machine will then cause the pull of the tractor to overcome the resistance of the spring 7 and the latter will be compressed until the ton us has moved ahead relative to the frame so t at the stops 8 and 9 abut against each other, of course preventin further forward movement tongue however the member 26 (which is connected to the tongue) is moved forwardly. This causes the upper end of the link 17 to be moved forwardly also, imparting a corresponding movement to the arm 13 andcauas, ing the arms 11 to be raised.

The raising of said arms of course th ugh the medium of the stop pins 12 with'which they are engaged, causes the bowl toturn rearwardly on it's trunnions until the blade is just level with the ground or in a nonscraping position. This position will then be retained while the scra er is drawn along the ground as long as the lbad remains in the bowl. Should the operator however decide that he desires to take a still heavier load, all he has to do is to pull forwardly on the ro e 31 whichis attached to the upper end of t e lever 28. Since with the forward turning of the upper portion of the link 17 as above described the lower end thereof moves rearwardly, the pin 30 in the lever 28 will now be at the front end of the slot 29a. The forward pull on the lever 28 therefore acts to pull the links 29 forwardly, restoring the link 17 to its original position; or in other words moving its upper end rearwardlyand causing the arm 13 to be moved rearwardly and the arms 11 to be lowered. Such movement of the link 17 can only be had with the rearward movement of the tongue relative to the frame, so that not only the link but all the parts of the structure are restored to their original positions. The total length and effectiveness of the lever relative to the point of connection of the pin 30 therewith is such as to enable this to be accomplished without excessive eifort. The bowl being always in contact with the ground will then of course reassume its scraping position and will remain in that position until the pull on the lever 29 is released. When the lever is thus released the bowl will at once again raise to its non-scraping position owing to the functioning of the tongue and the c0ntrol mechanism, as previously described.

When it is desired to cause the contents of the bowl to be spread it is only necessary for the operator to pull on the cord 22, when the arm 14 will be released from connection with the link 17 irrespective of the position of the latter; and the bowl will then be free to rotate to a spreading position as previously described. If it is desired to dump ith this movement of the rather than spread the load it is only necessary to retain a pull on the cord 22 until bothsets 'of stops 12 have moved past the arms 11, v The provision of the plurality of holes in the link unit 17 enables the point of connection of the member 26 with said link, relative to the pivot 18, to be altered. This obviously alters the leverage exerted by the member 26 on the link and enables the necessary adjustments to be made according to whether the dirt being scraped is of a. hght or heavy nature.

In the type of device shown in Fig. 6. in which the frame 1a is supported by wheels 32 which are preferably ournaled on the trunnions 3a of the bowl 2a, the automatic control mechanism is 'siibs'tantially the same as above described. The weight of the bowl however is distributedrelative to the trun-' nions so that it tends to tip down and 'forwardly of itself to a digging position, since it is normally not engaged with the ground.

The bowl stop pins 12a are arranged as pairs.

and instead of the plain arms 11 of the other type, segmental gear members 11a to engage the pairs of pins are provided,- Also an additional tension spring-33 is connected to and extends rearwardly from the link unit Otherwise the construction and ar-.

17a. rangement of the parts is the same. In the operation of this type the forward movement of the tongue 5a relative to the frame causes the bowl as before to tilt rearwardly until the blade just rides on the ground.

The weight of the load is suflicient to prevent the spring 33 functioning to further raise the bowl as long as the load is held therein. After the contents of'the bowl have been spread or dumped and the bowl is empty however said spring 33 acts to pull the upper end of the link 17a rearwardly, thus acting on the trip bar 14a and the arm 13a to raise the members 12a and likewise turn the bowl on its trunnions so that its blade will be well clear of the ground, as indicatedin dotted lines. A pull onthe loading lever 28a'then reverses the position of the link: 17a and causes the bowl to be lowered to a scraping position just as described in connection with the first type. It is however necessary to retain a pull on this lever until a certain amount of dirt has been scraped into the bowl sufficient to overcome the tendency of the spring 33 to raise the bowl to a transporting position.

The above structure represents a considerable improvement in the operation and control of wheel mounted scrapers, in which the bowl can usually be moved only to a ground clearin position. This usually causes a considerab e' portion of the load to be lost before it has beentransported to the place where it is to be dumped on account of the fact that the blade is not engaged with the ground and any dirt whichspills out from the front cannot be salvaged. Byretaining the blade against the ground however just asin the drag type, this objectionable feature is overcome and the wheel mounted type has all the advantages of the drag type with the additional benefits had by reason of the wheels, which facilitatetransportation of the scraper as will be obvious.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set'forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined bythe appended claims.

Having thus described my invention what I claim as new and usefuland desire to secure by Letters Patent is:

1. A scraper including a rotatable bowl, a

frame supporting the bowl in a manner to cause the same, when the frame is drawn forwardly, to assumega scraping position, a draft tongue forwardly movable relative to 'the frame, a spring normally resisting such movement of the tongue, a stop projecting from the bowl ahead of the axis of rotation thereof, a transverse shaft on the frame ahead of the bowl, an arm'projecting rearwardly from said shaft and under the stop. a vertical arm upstanding from the shaft, a vertical link pivoted on and projecting u wardly from the frame ahead of the she t, a connecting bar between the vertical arm and link above the pivot of the latter, and a member mounted at its forward end in connection with the tongue and connected at its rear end with said link above the pivot thereof.

2. A structure as in claim 1, in which the point of connection of said member with the link is adjustable relative to its distance from the link-pivot, whereby to alter the leverage effect on the link and the arcuate distance through which the same' will swing with a certain forward movement of the tongue relative to the frame. f

I 3. A structure as in claim 1, in which the bar is disengageably connected to the.link, and trip means is mounted on the link to effect such disengagement at will.

4. A structure as in clalm 1, with a hand lever pivoted on thetongu-e ahead of the link,

lev'er pivoted on the tongue and operatively connected to the link to move the portion of the same above its pivot rearwardly with a forward pull on the lever.

6. A structure as in claim 1 with a hand lever pivoted on the tongue, and connections between the lever and link to enable the latter to be ulled rearwardly and arranged to cause said lever to remainundisturbed until the bowl has been turned to a non-scraping position.

7. A scraper including a rotatable bowl, a frame supportin the bowl in a manner to cause the same, w en the frame is drawn for wardly, to assume a scraping position; a draft tongue forwardly movable relative to the frame, a spring normally resisting such movement of the tongue, connections between the tongue and bowl for turning the latter to a non-scraping position when the resistance of the spring is overcome and the tongue moves forwardly relative to the frame, and means including a forwardly moving lever for restoring the bowl to a scraping position against a pull on the tongue.

8. A scraper including a rotatable bowl, a frame supportin the bowl in a manner to cause the same, w en the frame is drawn forwardly, to assume a scraping position; a draft tongue forwardly movable relative to the frame, a spring normally resisting such movement of the tongue, connections between the tongue and bowl for turning the latter to a non-scraping position when the resistance of the spring is overcome and the'tongue moves forwardly relative to the frame, and a hand lever separate from but operatively connected to said connections for returning the bowl to a scraping position and arranged to cause said lever to remain stationary relative to the tongue while the tongue is moving forwardly.

9. A scraper including a rotatable bowl, a frame supporting the bowl in a manner to cause the same, when the frame is drawn forwardly, to assume a scraping position; a draft tongue forwardly movable relative to the frame, a spring normally resisting such movement of the tongue, connections between the tongue and bowl for turning the latter to a non-scraping position when the resistance of the spring is overcome and the tongue moves forwardly relative to the frame, said connections including a vertical link pivoted on the frame and arranged to move forwardly at its upper end to effect such turning of the bowl; and a hand lever separate from the link and connected thereto for moving the upper end of the link rearwardly with a forward pull on the lever.

In testimony whereof I afiix my signature.

DAMON R. THROOP. 

